James p



@uitrit Qtstrsv get-rut ffice;

Laerrgpafmt No; 71,464, daad May 5, 186s.

IMrRovnMnu'rIN-MEGHANIGAL MOVEMENT.

@Dit ltlgelmlz :stemt tu in time tgtttrs hartem mit mating pitt ni ttt imite.

To ALL WHOM` ,rr MAY ooNoEnN: y

Be it'known that I, JAMES P. DAVIS, of Stiles, in the` county of Oconto, and State of Wisconsin, have invented anew andusefiil Improvement in Mechanical Movement; and I do hereby declare that the vfollowing Y is a full,'clear, and exact/description thereof, whiehiwill enable those skilled in the art to make 'and use the same, reference being had to the accompanying drawings, forming part ofthis specification. l

` Figure l is a-sectioual elevation of my improvement.

Figure 2 is a cross-section of the same through the line x :11, tig. I.

Figure 3 is a detail view of the gearin A Figure 4 is a diagram exhibiting the position yof the friction-wheels -ut the end of -the stroke.

Figure 5 is a detail diagram, exhibiting the manner of connecting the crank-shaft 'with the main shaft.

' Similar letters of reference indicate corresponding parts.A v i This invention relates to certain devices for the purpose ofconverting rectilinear into rotary motion without employing a crank upon the main shaft.

It consists in the mechanism now to be set'forth.

In the drawings, A lis the bed-plate supporting 'the iy-wheel bearings and frame B, which latter furnishes Ithe bearings for the friction-wheels D and loose', pulleys E. The cross-head F works with close contact with and between the friction-pulleys D; the loose pulleys E being also in contact with the cross-head, asA shown. The upper and -lower surfaces of the cr'oss-headhare slotted, to receive the adjustable friction-racks a, which are raised or 'lowered by the set-screws b, whereby the said racks are brought to bear upon the frictionLpulleys withA the proper degree of contact for transmitting its rectilinear motion to them, v Gear-wheels G G are mounted rigidly on the shafts of Vthe friction-pulleys, und exterior tovthe frame-B, as shown. v'lhese wheels engage with a middle wheel, H, k'eyed on 'the shaft d', which is properly the main driving-shaft, which latter is to be connected with the machinery to be driven. These three gear-wheels have equal diameters. v The loose pulleys E are for the purpose of holding-the cross-head firmly, and thereby prevent its springing. The semi-circumfereuces of the friction-pulleys are equal to the stroke of the piston. IOne-half ofthe periphery'of each friction-pulley,- ns from e to e', is recessed or cut away lower than the remainder, for the purpose of relieving the said pulleys from contact with the racks on the cross-head at the completionof the stroke of the latter.

The friction-surfaces m impinge alternately against upper and lower friction-racks respectively, cross-head is actuated be and fro by the stroke of the piston. The friction-surfaces of the friction-pulleys are made slightly lessv than a semi-circumference by the short recess t', whichl is Amade for the purpose of enabling the friction-surface of one pulley to pass from contact with its friction-rack just the instant before. that of 'the' opposite pulley comes in contact with its respective ruck at the return-stroke of the cross-head. By the reciprocal motion of the cross-hehd, the friction-surfaces of the friction-pulleys impinge alternately uponjthe friction'- racks, and are thereby actuated in one direction only, for at the completion of the stroke in either direction, one of the pulleys passes from contact wiih the cross-head, by means of the recessbefore mentioned, and would remain at rest while the cross-head completed the contrary stroke, if not forced to continue itsrotation by the middle geur-wheel H, which is drivenby the gear-wheel Gr or G on the shaft of the friction-pulley, that took motion from the cross-head `iust us the other passed from contact.

, To insure theiregular and certain action 'of the friction-pulleys, a single coglor projection, n, is aiiixed to theend of each friction-rack, and comes in contact with the shoulder c', as shown at iig. 4, just before the completion of the stroke, and, with a positive motion, carries the friction-surface clear'of the rack by bringing the short recess at the lowest point of the pulley. p, The cross-head is then relieved from contact with ,the frictionsurface of the other on the return stroke. This action takes place at each end ofithe stroke, for the continued revolution of the frictiompulleys brings the friction-surfaces, shoulders, and recesses, back to the proper 'position for repeating the .movement at each stroke of the piston'. v

In practice, a pulley, I, is keyed on the main shaft d', and abelt, h, con shaft and tlywheel, as'shown at tigs..1 and 5f I ects the main shaft with the crankwhen the l nnectionvof the crank-shaft and main shaft steadies The 4crank limits thymotion of the-cross-head; and the co l nd conducs to the regular and respondent action the motion, thereby preventing any backlash of the gearing@ of the whole mechanism.

Y My invention is simple and fro'ma rectilinear motion .in a highly satisfactory manner.

I claim as new, and desire to secure by Letters Patent- 1. The recessed friction-pulleys' D and racks a, operating substantiallyas shownand described, and for the 2. The gear-Wheels G .G HJ substantially :rs-shown' and described, 'in combination iVith Vthe friction-pulleys D D, as and for the purpose set forth. I

3. The pulley L'beltand ily-wheel, substantially as sh recessed friction-pulleys D and cross-head Eifer-tho purpose o thoparts, all as set forth.

` 4. The cross-head F, ccgs mfrictionmaclss a,

'own and described, incombinaton with the f accomplishing the more perfect working of Y substantially as lshcwn and. described, in combination with th'e fiction-pulleys D, all as and for the purpose set'forth.

The above specification of' my invention signed by me, this 30th day ofl'Nove'mber, 1867".

' JAMES 1. DAVIS.4

Witnesses: y

. B.. G. Cowan,

J. 0. Kursliste'.

eicient, and has been proven', by experimental triahto produce a, rotary motionA 

